U.S. Treasury Secretary Jack Lew said on Wednesday that conversations between central bankers in the United States have shown they have increasingly understood the need to be clear in their communications.

"The conversations amongst central bankers have shown an increasing understanding in the need to be clear in communication, and I think I'll leave it with them to communicate those messages," said Lew after being asked about the prospect of a U.S. Federal Reserve rate hike.

Speaking at the London School of Economics, Lew also described an early-year slump for the U.S. economy as "somewhat anomalous" and added that the labor market was showing signs of continued recovery and growth.